ardour/libs/evoral/src/SMF.cpp

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/* This file is part of Evoral.
* Copyright (C) 2008 Dave Robillard <http://drobilla.net>
* Copyright (C) 2000-2008 Paul Davis
* Author: Hans Baier
*
* Evoral is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define __STDC_LIMIT_MACROS 1
#include <cassert>
#include <iostream>
#include <stdint.h>
#include "libsmf/smf.h"
#include "evoral/Event.hpp"
#include "evoral/SMF.hpp"
#include "evoral/midi_util.h"
using namespace std;
namespace Evoral {
SMF::~SMF()
{
if (_smf) {
smf_delete(_smf);
_smf = 0;
_smf_track = 0;
}
}
uint16_t
SMF::num_tracks() const
{
return _smf->number_of_tracks;
}
uint16_t
SMF::ppqn() const
{
return _smf->ppqn;
}
/** Seek to the specified track (1-based indexing)
* \return 0 on success
*/
int
SMF::seek_to_track(int track)
{
_smf_track = smf_get_track_by_number(_smf, track);
if (_smf_track != NULL) {
_smf_track->next_event_number = (_smf_track->number_of_events == 0) ? 0 : 1;
return 0;
} else {
return -1;
}
}
/** Attempt to open the SMF file for reading and/or writing.
*
* \return 0 on success
* -1 if the file can not be opened or created
* -2 if the file exists but specified track does not exist
*/
int
SMF::open(const std::string& path, int track) THROW_FILE_ERROR
{
assert(track >= 1);
if (_smf) {
smf_delete(_smf);
}
_file_path = path;
_smf = smf_load(_file_path.c_str());
if (_smf == NULL) {
return -1;
}
_smf_track = smf_get_track_by_number(_smf, track);
if (!_smf_track)
return -2;
//cerr << "Track " << track << " # events: " << _smf_track->number_of_events << endl;
if (_smf_track->number_of_events == 0) {
_smf_track->next_event_number = 0;
_empty = true;
} else {
_smf_track->next_event_number = 1;
_empty = false;
}
return 0;
}
/** Attempt to create a new SMF file for reading and/or writing.
*
* \return 0 on success
* -1 if the file can not be created
* -2 if the track can not be created
*/
int
SMF::create(const std::string& path, int track, uint16_t ppqn) THROW_FILE_ERROR
{
assert(track >= 1);
if (_smf) {
smf_delete(_smf);
}
_file_path = path;
_smf = smf_new();
if (smf_set_ppqn(_smf, ppqn) != 0) {
throw FileError();
}
if (_smf == NULL) {
return -1;
}
for (int i = 0; i < track; ++i) {
_smf_track = smf_track_new();
assert(_smf_track);
smf_add_track(_smf, _smf_track);
}
_smf_track = smf_get_track_by_number(_smf, track);
if (!_smf_track)
return -2;
_smf_track->next_event_number = 0;
_empty = true;
return 0;
}
void
SMF::close() THROW_FILE_ERROR
{
if (_smf) {
if (smf_save(_smf, _file_path.c_str()) != 0) {
throw FileError();
}
smf_delete(_smf);
_smf = 0;
_smf_track = 0;
}
}
void
SMF::seek_to_start() const
{
_smf_track->next_event_number = 1;
}
/** Read an event from the current position in file.
*
* File position MUST be at the beginning of a delta time, or this will die very messily.
* ev.buffer must be of size ev.size, and large enough for the event. The returned event
* will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
* rate given by ppqn() (it is the caller's responsibility to calculate a real time).
*
* \a buf must be a pointer to a buffer allocated with malloc, or a pointer to NULL.
* \a size must be the capacity of \a buf. If it is not large enough, \a buf will
* be reallocated and *size will be set to the new size of buf.
*
* \return event length (including status byte) on success, 0 if event was
* skipped (e.g. a meta event), or -1 on EOF (or end of track).
*/
int
SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
{
smf_event_t* event;
assert(delta_t);
assert(size);
assert(buf);
if ((event = smf_track_get_next_event(_smf_track)) != NULL) {
if (smf_event_is_metadata(event)) {
return 0;
}
*delta_t = event->delta_time_pulses;
int event_size = event->midi_buffer_length;
assert(event_size > 0);
// Make sure we have enough scratch buffer
if (*size < (unsigned)event_size) {
*buf = (uint8_t*)realloc(*buf, event_size);
}
memcpy(*buf, event->midi_buffer, size_t(event_size));
*size = event_size;
assert(midi_event_is_valid(*buf, *size));
/*printf("SMF::read_event:\n");
for (size_t i = 0; i < *size; ++i) {
printf("%X ", (*buf)[i]);
} printf("\n");*/
return event_size;
} else {
return -1;
}
}
void
SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf)
{
if (size == 0) {
return;
}
/*printf("SMF::append_event_delta:\n");
for (size_t i = 0; i < size; ++i) {
printf("%X ", buf[i]);
} printf("\n");*/
if (!midi_event_is_valid(buf, size)) {
cerr << "WARNING: SMF ignoring illegal MIDI event" << endl;
return;
}
smf_event_t* event;
event = smf_event_new_from_pointer(buf, size);
assert(event != NULL);
assert(_smf_track);
smf_track_add_event_delta_pulses(_smf_track, event, delta_t);
_empty = false;
}
void
SMF::begin_write()
{
assert(_smf_track);
smf_track_delete(_smf_track);
_smf_track = smf_track_new();
assert(_smf_track);
smf_add_track(_smf, _smf_track);
assert(_smf->number_of_tracks == 1);
}
void
SMF::end_write() THROW_FILE_ERROR
{
if (smf_save(_smf, _file_path.c_str()) != 0)
throw FileError();
}
} // namespace Evoral